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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1f84826cb888c2a86e53952b9e9653add0c9a3088b0a5143e373a6f845b768' 
  AND token = 'C7Atwn3aX1Hi+RPCWh3e5hW5MJvkJzJV0eS6s0VeT6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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