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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773576870cfa10a445cce0e4d0158a3475122a39bf0f31e3b9858062c9ea16f0' 
  AND token = 'qLudl/sn1rct/XYK70d4ndpMAVijoy6Xxi6MU4c5UPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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