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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b1b99bb4f46f2b9053250346fbdf3618e5d5e5e0cf9fd8b1040cffa39c0d209' 
  AND token = 'R9qjBiiFp3SuOJAF95TDV9HqR023vkaWedh5IZMvhKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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