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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd60c3decead3d2c75980aa96a4036058474ce7d54e5a3ace2f7ec7c48e3c709' 
  AND token = 'NuAvk57trkLFnNuG8tVBJDRpJM8W6jMEqip1SeSCilY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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