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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b711e59bf3e4d1f2334e0904cab747516054f7ab785f9ccace4437f86c3aaee' 
  AND token = 'I0TRQebtLP6emV3kyvJpv6i9VnplpyY0/yPW/dqzAP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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