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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58cb3f22c61c45679e3e9238dd4719423decbefdf13c0ccf6a68dc608c10ab22' 
  AND token = 'kl06gToCYltxsjKjyPWIdev0yKFyyx8eDzzqh2eXZyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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