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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84d89cbdb9e9f89f3c6cee4e36c07b466dc04fe21579dca62f97b8dca3aafb1' 
  AND token = '3dGxFXQ7dvR9tTXLPxsC4w/uVBi8/CtzKBvni0iHyQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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