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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd18e666aeaa899e9daa789e1f65807971d41a927f50ee846f990d5471c2283b' 
  AND token = '/fLnYhrdyraVfvL4Q1bzaFqnGQlDxpzFiniIW1V4yvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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