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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26dc65a9e7c441894af6d800b7730eb6d298f640a436885ae2e9966ed182a8f5' 
  AND token = '1Fbku7PmyRuP4NyN9RSKc504TABzSZJ+GI8PUIh4tbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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