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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7707b0f57e65fcdc4c6b99f47cc834e1f4cb43d6ccdad2ab5e2f3ed7ee87d2e2' 
  AND token = '0PjR/YxMoMcR9Y5n8WMFCCd5rK+E+qjmbUW8jtmgXx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}