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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e8153c54a549d1841637b2576d8a1a97038188d5ea7a3025d742ef076708c1' 
  AND token = 'A/OQG2aDDagmZhAlEjk8A0P8L97NV52Jgu9UZsXuF4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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