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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6dae8774827b9e9fbe3b75eb4461d259ad9ca562b141d2e14dd69a2f032dd5e' 
  AND token = 'DdevpuatOxk3N/Hw5BEmdVeaf7WZ/plRLReGiYZBSyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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