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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f4b50356616cf37fec91447723f78a49b7f5c265ca3e5ad9a385a6322b98db' 
  AND token = '4HJ5vtIicmIojqmS09n4oUI2rUhuTP75G6MK9iOjby0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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