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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf83c10d261b2719f54b1cf98f0120733116e41027d2895c696353e3d129a7b' 
  AND token = 'aokqeCzYa/Cqdbi5gaq6x1nycrJxYoIcNhzdKkWWFLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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