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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c700296d97076c2c4e991c78b835661499ea532d054a9c4e18a231523e9ef49e' 
  AND token = 'WrCNB8Fo30OAGylaSv+ruFY1szrTr4wvA84Ft+qEcYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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