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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d737b90250fa1f0065369c5b85b7ac507d8b50aa626bae503011cccdedd4a9f' 
  AND token = 'OP6LB3tzNcjFoRs7e2J54WpegAAfrobaEFji4dn7HKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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