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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc05cad25040f0c2091c027b934b141f19616e98f3302f3b96e29e64031da03f' 
  AND token = '5hmr2y9FmP4N5/PS6Ruyvq/Qgq/hipZWsG6e/cJUQpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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