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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f7dd4962db1c64559a8075227681154d78e035d3bdd97b0ec05c935ca64c8d' 
  AND token = '4Pt4c6zazzQ0K69YXbdq+VrhfFmTs7uo8dYtba29iZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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