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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32ca2a2ccc8bbfeeada326c297692ad498f89ecf27b34f935468473ddc259d6' 
  AND token = 'mAi+Rh6iyPMfEEHHbF/QBMerzx0800RcW06iEw1FGrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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