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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96411d15e775bc9fa6ca718ab25e57057e92ed9abce8c9a6f559c159322870c9' 
  AND token = 'BHHb+JOoePOuK90B9EvEvSwakjI6OiJg+5OmJAzYFGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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