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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874b3842245e44a3d4a5f96e6c2f79bef3bb527c9f466be180bbdcad290e7ea3' 
  AND token = '1SpQKyUkYBAfjCcsQOI2sx1iWtkBTT06+HTyIR0NFVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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