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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f75eb528153543f43eea2e208dba518998c2a7576c09108499ad4982a78555' 
  AND token = 'gO8v8XsrSyyutWT3DEcomgrgcQMpfmqjUcfqHQPv2+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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