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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5cb6f05ff10b905573ac2e478dbc3d845b4c99ae2111713122e45a79f735dfa' 
  AND token = 'rriW7Mv8vJC4+Akvad7OmRyX5t0IsA/+ld9vC8croOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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