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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510f5e871d0a1c14e8edff8f90822caf624fc63547d0f2bdd7a073e2c819bfad' 
  AND token = '/hJalZ06py2d3N1T3WlxK+WJJVJaHfa4hng5+jEVQhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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