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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9a9d28b48d0b034da84cdb59d686f220d6bbccfe2c25bf0410c1c7e318c752' 
  AND token = '87uBGy9j448mi3cEBba+QQzAqfFhWOC5TtnGIoN6iys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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