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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9cf4b29ba47949f6764eb3bbf3b665674398d904bbc1bf92247ee52846efbb' 
  AND token = 'E6iHxu96/z5AJrSp0jsLcNH8dfzI76sGwfTAVvaZZ14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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