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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f58d4b9c0c37c73ddb2c2e9b93be51aa25bf26e1c15e70ca9866f4fd0a8098f' 
  AND token = 'dCha00rXsgqlv4Cc8nDvrm5KHxCgRsswPABMaFq+reA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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