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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2fe41a75967183bb5e58d43979ac3e674eb542d5001952194b512498d11ebd6' 
  AND token = 'v0xr9R642Tx8J6GHpdGUHtQcYYOOHZRKP7Fo0CMKPyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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