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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fadef678e772ca6b8c45f543471c1c472922ed0c63248679f9efff45ecde2cc' 
  AND token = 'W4vAt6vF65uenJiPSR6HGjPOMXJD2ScynacUhQ9BlXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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