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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e594f4a0a98673bb904f63316d84ced5c45fcd6a3252a3c352476bb404bae9b' 
  AND token = 'BCCqwwAJx8ZIRdvo91stfsugUx73u824yotagA5dZ50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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