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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a3ae781814725bab96541134d1c60ed9f7702c98c506422683cba7afbe1f86' 
  AND token = 'sq9ANM4Dh8YpNoeolWTyaC+I02SxS7ojfnEPhmWYP6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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