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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41384d30d4ec5d9cc65dbcedb9f16b5eed26ad229a3a2d2d2c11cb76ef27be56' 
  AND token = '+Z/pDeY/pJ5at916aVAUKkxAVYFzUICWjeXUbjiNGCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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