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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfbe7c7935b7e96958daca8d36fc3a0932ea10b6ba16f838f14572e5c2903901' 
  AND token = '/JUu39m04vhU40eJF8UJm+MmBb/H4sRLA/UVjs4fGvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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