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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf461f3d4da49a67e7c0c9536a79eafb829fe229c72ac1ee35114fee6d909bfc' 
  AND token = 'xcrru/0Lb9NHWRFdl55ULA7ivZTH7EjtOKlLh+QqVYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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