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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa6b35e40e4c079d712467cbeb771180e1adb763289c0b0e83ada8222055cce' 
  AND token = 'Q7jmlNAfAVQAMsefW4g4nx2JRCfjBsN/OiKxGDNS80s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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