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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155d5807d0ceaf86a64e1e58fc1b366e5f029f2b7f487d1b45d76eb2222d59c5' 
  AND token = 'MaoR7wrp6uWbJqeqW55wz6LEvitw48eK+/0ETxM6EAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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