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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ae34790e1e6308b6cfcbb9b59a583fc5d7ceece2882980f131b078771fa082' 
  AND token = 'Fc0Dpe9k5CFNBMejlo7/hyQ+3UPdiuryLDyMh69840M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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