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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617a595495df6d389abba8b35b942563a137bc2dd92402ed4a6cd0ea69e941eb' 
  AND token = 'mhmDkJN6iOIR+rDnKcp8XZjy8r4ZlLdV60GWjou1PxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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