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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce07f137de91447608e31d481ff014ee2e71db6c862f03ac137628cbf2aad4a' 
  AND token = 'OJTRm7FeFg8XN1s2TLVAgNcfE5XeCcWi4ETFfrp+L1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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