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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c37c8f93334955823989985c163a7a319e1e84134611a16a3f62463a2085afb' 
  AND token = '6PSQlc5xavan/NWT+3KHgyI07/0Q6VfdXOf7/FTJrHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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