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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4fc7e2483f3b10af5efdaddb74c7648d7dd834d8e783065aadb6df8e34a094a' 
  AND token = 'voCOl2gq+Gr8FXZbewG9M8Z7orrHhVT4fwUY3mJlTPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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