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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f310326cf8f6dfae0477abb5115ae2180f309192ece4b72e796a2c84ff83a34' 
  AND token = 'leIa7J9YFkVeQ89RRzMESjvAcxSrqAS3wopX5Ay/D3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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