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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf3e2082eb0cd651f01baaf00814c2071b5015e16ab61d9f60ad8f7b60dcc73' 
  AND token = 'rMJ5L1Z6uimqNX78FJ/hPUmm3pUwpiBCaVgLwisIxsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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