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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43e140d34ba275c52c726e3455363bd64851b0318a620ae085f2d1c2e212c8e0' 
  AND token = 'TUHJMAw9J21JKEHyXLFrlGJquWqVAsKvW+VWOViMt+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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