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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeee738eba9c01e4b9d45c3f86b24392d54b9e3cf16ea6559fada642f002115e' 
  AND token = 'AV0OZK6wOmmoQGBWu+EYln4BaW+6s8DzF5yPl+2zGMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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