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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ffe7254349922fdb9fa218cf78fc1858bfb655e092cbd349ce2e61e29bdd6d9' 
  AND token = '4G+cXF+PfbV+S2DelRjPInw9mK0JTTNVPccp2O/2i60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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