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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959b7a1b718996cab3e07679811f621e1a5a1216f5a7edf0f68715c963d5655e' 
  AND token = 'Vn2Gsyl8diRF3sOtUKqNCCcOC7P+ney0dC44M1PLryY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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