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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2a5475a570f7d4661cd9e2fa17c1f13d3bb123ee0b3a726c6d6c2969fccea1' 
  AND token = '+eqNMK903cVj4/RCOxBHi62CRO3l/xVUgRU+I+XKAW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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