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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9f08b56b736401d3afe6d0b1a766e4f7f682ebb40a56f692638492f7e2b93a' 
  AND token = 'h6C//fav7iu3/6waVwTPqXQHcsHpk3e9s1GIxZhffR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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