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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b8238eb718c6b4318ca3790af38a39a4611f21e7e0c1028a78c12e358e5e2d' 
  AND token = '+shFGZfp3KhoXBrCJqpzT0mrAllVCo8XXDE74J/p1fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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