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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088ea1d23dce9ee15c618350a5e0c9350ede31a3ebb8d1c8a64e2c7c67c098f2' 
  AND token = 'H69cAG0ju2xr/hNoGWE+Ybt4u17TufHwWzmwEDaOpDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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