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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e68ec36d4ebeb5720a5b02b483db5121e750f172679a7a45296e41213b1cecb' 
  AND token = 'YFYV1i2blL0dzdJC4nErFxPDp/Wyx0ayumEVvbBgrzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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