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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9feec780aab6b49edac2d659849aef189a588dbc681b0e5318fa6825119c2c57' 
  AND token = '5P4Qlf7o029vU97RbEOinvjU2xRIYfCF1GTNVtXqi9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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