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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319278067a8682f16a34cd27083aa522f0507766cc34f0e137ffa8562db3044c' 
  AND token = '+pi8FEY5w30gd5fg6ijk8WmxO3FWA/V398NDEAiIHLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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