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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bc4577301bead1a8592b39c021bb71f316cd00d1d76cd21e2deeafa427a879' 
  AND token = 'wps6HoyEttlO513vpsh5XM3LbjhewU/iUeDl5LHp/dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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