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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569e6e21934f338571f619ac8ad55a5456d603977df0b8d4906a220756c5a7e7' 
  AND token = 'if0uViGDDffahJeohsVz+V+P72yg6SJQpoExVws4Cog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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