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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471bb7a0e79f9a931ff53b28b73d60d9f0748d0b5c4287e7565eb7766a71c30e' 
  AND token = 'tnmlL4o+2fhWdGJK3KMRHlDC0AcPt+WCooYV2CzKuaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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