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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42cac8f5ee93b3bd384d9dee0ddff5a29b3f92c9afc6cbe679d4bb026e8a9b92' 
  AND token = 'GYdiEpy/bH5istpi8e8PkrDvmWqnRwdNXlHObKSm788=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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